Thank you for your reply however, the Classroom app does not work using iPadOS 14.4.
lt does work with iOS 12.5.1 but not since iPadOS 14.x was released.
We use the Jamf School MDM but they say that this is an Apple issue.
The “Actions” window (see image) automatically appears as soon as you enter a class and will not disappear. iPads can be seen as connected in the background but the Actions window will not close.
Also the only way of exiting the app is to press the Home button and then you can close the app.
This issue means that the Apple Classroom app can not be used by teachers in class.